Electric-arc lamp.



' No. 632,707. l Patemen sept. l2, m99.y T. M. FOUTE.

ELECTINC ARC LAMP. Application med :Ane 1s. 1896 (No Model.) 3 Sheets-Sheet t.

aL-632,707'. Patented sept. l2, |899.

T. M. FooTE.

ELECTRIC ARC LAMP.

(Application led June 15, 1896.)

3 Sheets-Sheet 2.

(nu Model.)

Lc .3. y n gg. j 33 37 Li//J y l M w y l 5/.36 Ll' L u j: @4g .35 ll .HV 35 1 5L y 32:

nu: man rmm cc. mma-Luna.. wunmmovl. u, cA

No. 632,707. Patented sept. l2, |899.

T. M. more.

marmo Anc LAMP.

(Appumion mad nu 15, 1am).

3 Sheets-Sheet 3 (llo Model.)

@mmm @0d 1n: novum Urns co. moyenne., wmlnumu. u. c

UNITED STATES- PATENT OFFICE.

"rIIEonoRE M. FoorE, or CHICAGO, ILLINOIS, Assienon or ONE-HALE rro cI-IARLEs n. sEEBEEeEE, or sAME PLACE.

ELECTRIC-ARC LAM?.

srnCIrIcArroN forming part of Letters Patent No. 632,707, dated september 1e, ieee.

Application filed June l5, 1896. Serial No. 595,622. (No model.)

To all whom, it wtcty concern:

Be it known that I, TI-IEoDoIaE M. Foo'rn, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illi nois, have invented certain new and useful Improvements in Electric Arc Lamps, of which the following is a specification.

My invention relates more particularly to certain improvements in the type of arc-lam p known as a focusing-lamp.

The object of my invention is to accomplish a feed of the carbons through the instrumentality of a shunt-magnet or solenoid7 a train of transmitting wheelwork and a shunt-circuit maker which normally maintains closed the shunt-circuit, includingr the shunt-magnet, said shunt-magnet when energized by abnormal are acting to operate the circuit-maker, which serves also to withhold the train of wheelwork,.whereby said train in turn feeds or permits a feed of the carbons, the movement of said train in feeding and the movement of the circuit-maker in releasing the train operating con j ointly to completely sever or break the shunt-circuit in such a manner as to discharge the shunt-magnet and permit the circuit-maker to again engage the train and reestablish the shunt-circuit.

My invention, to this end, consists in the provision of a train of feeding wheelwork the driver of which has a toothed periphery, a contact-maker engaging the toothed driver and holding the train stationary when the arc is normal, a shunt-magnet the armature of which withdraws the circuit-maker to permit a feed, and a circuit so arranged as to include the shunt-magnet, the circuit-maker, and the train-driver in a shunt-circuit relative to the arc interval, the point of electrical contact being between that tooth of the driver engaged by the contact-maker and the engaging end of the contact-maker, whereby when the circuit-maker is withdrawn the point of contact on the driver moves away from the cir cuit-maker, thereby fully and completelysevering the shunt-circuit.

My invention has certain other objects inA view; and it consists in certain features of construction and arrangement about to be particularly described, and pointed out in my claims, reference being now had to the accompanyin g drawings, in whichm Figure 1 is a side elevation of my improved lamp, the side of the regulating-mechanism inclosing casing bein g removed, showing said 5 5 mechanism from one point of view. Fig. 2 is an end elevation. Fig. S is a side elevation showing the regulating mechanism from a point of view on the side opposite to that shown in Fig. 1. Fig. 4 is an enlarged rear elevation 6o of the shunt-magnet and connected mechanism.' Fig. 5 is a detail sectional view of the means whereby the carbons may be manually adjusted independent of the lampregulating mechanism. Fig. 6 is adetailcross-sectional 65 view on the linexoc of Fig. 5. Fig. 7 is an edge view of the shunt-circuit maker and driver for the train of wheelwork. Fig. 8 is a detail view of the insulation for the upper carbonholder arm. Fig. 9 is a diagram showing the 7o circuits of the lamp.

In carrying out my invention I provide many parts which are common to lamps of the focusing type, which I will nowbriei'ly de scribe.

I employ two vertical rackbars 15 and 1G, carrying th e two carbon-holder arms 17 and 18, respectively, for the upper an d` lower carbons 19 and 20. Depending from the holding-arm 17 are the main or series magnets or solenoids 8o 21 and 22, which act upon one end of a pivoted lever 23, carrying on its other end a carbon-holder 24, slidably mounted in the end of the holding-arm 17. By means of this construction and arrangement the arc interval is initially established. The course of the current through the main magnets and arc is from the positive binding-post 24 through the frame of the lamp, through the leads 25 to the main magnets, and from thence through 9o the holding-arm 17, by reason of the insulation shown in Fig. 8, over contacostrip 27 to the upper carbon, thence across the arc to the lower carbon-holding arm 1S to the rack-bar 16, and thence through the frame of the lamp to the negative binding-post 28.

l will proceed to describe the construction and arrangement involved in my invention, which, as stated, has as its object the provision of more sensitively and positively acting Ioo means whereby to feedthe carbon.

I provide a shunt-magnet or solenoid 29, disposed within the casing 30 in a vertical posi-- tion, the lower end of the core of said shunt-- magnet acting to attract and oscillate in one direction the armature-frame 32,pivotcd at 33. As shown more particularly in Fig. 4, an escapem ent-lever 34 is pivotally mounted on an extension from the frame and connected at its lower end by a pin with the armatureframe 32. A spring 36, connected at its upper end to an arm 37, secured to the armatureframe 32 near its pivot-point 83, serves to normallyhold the armature-lever away from the core 3l of the shunt-magnet 29. When the armature-frame 32 is attracted by the core 3l of the shunt-magnet 29, the escapementlever 34 is also vibrated by said armatureframe 32. Referring now to the train of feedwheel work, the driver of the train is designated at 3S, of particular construction to be described, and is mounted upon the shaft 39 in a iixed position. Also mounted upon the shaft 39 in like manner is a clutch-arm 40, carrying the clutch 4l, consisting of the springarms 42, embracing the collar 43 of a sleeveshaft 44, mounted loosely upon the shaft 39. A counter-shaft 45, having on its end exterior of the casing 30 a hand-wheel 4G, which also has respectively mounted thereon the pinionwheel 47, meshing` with the rack-bar 16, and also carrying xedly on said shaft 45 a gearwheel 4S, which meshes with a pinion 49,1ixed on the sleeve-shaft 44, the gear-wheel 48 also meshing with the rack-bar l5. lVhen it is desired to separate the carbon-holders manually, the hand-wheel 4G is operated to rotate the shaft 45, @arising the gear-wheel 47 to move the rack-bar 16 vertically in one direction, while the gear-wheel 4S moves the rack-bar l5 in an opposite direction. In this operation the gear-wheel 4S simply rotates the sleeveshaft 44, which slips through the sp1-iu g-arms 42 of the clutch 4l; but it is evident, however, that the driver-wheel 38 of the same may be rotated in unison with the sleeve-shaft 44 by means of the clutch-arm 40, xed on the shaft 42, and the clutch 4l.

The driver-wheel 3S of the train of wheelwork is constructed of two disks or wheelseetions 50 and 5l, held together mechanically, but insulated from each other. Fach of the wheel-sections 50 and 5l is toothed to permit the engagement alternately of the head 52 of the escapement-lever 34, the said escapement-lever serving to withhold the driver-wheel 3S from rotation under the inliuence of the rack-bars 15 and 1G, which normally tend to rotate said driver-wheel by the iniiuence of gravity, the said escapernentlever 34 normally engaging the teeth of the wheel-section 5l. The wheel-section 5l is insulated from the shaft 42,and,as stated, is also insulated from the wheel-section 50, which latter is electrically connected with the frame of the lamp through the shaft 42.

One terminal of the shunt-magnet 29 is connected with the positive binding-post 24 and the other with the contact-spring 52, which latter bears upon the side face of the wheelsection 5l of the driver-wheel 3S, so that the course of the current upon abnormal arc increase is from the positive binding-post through the shunt-magnet 29 and contactspring 52 to the wheel-section 5l and from thence through the escapement-lever 34 to the frame and to the negative binding-post. When the shunt-magnet 29 is energized to a sufficient degree the pivoted swinging armature-frame 32 is attracted byits core 3l,thereby withdrawing the escapement-lever 34 from its normal engagement with the wheel-scction 5l of the driver-wheel 3S a`nd engaging said escapement-lever 34 with the wheel-section 50, electrically connected with the frame and negative binding-post by the shaft 42. By this means the shunt-magnet 29 thus breaks or severs or opens its shuntcircuit, completely discharging said shunt-magnet, whereby the spring 3G is afforded free opportunity to swing the armature-frame 32 away from the core 3l of the shunt-magnetand carry the escapement-lever 34 again into engagement with the driver-wheel section 5l, which by the gravity influence of the rack-bars l5 and 1G has fed forward one step, this rengagement of the escapement-lever 34 serving from further rotation and also reestablish or to check or withhold the driver-wheel 3S clcse the shunt-circuit. It is evident that the gravitymovelnentof the rack-bars l5 and lli, carrying the carbons, operates to approach the carbons toward eachother, and if by such movement the proper are interval be not restored the shunt-magnet 29 is again energized, and wit-hdrawingthe escapement-lever 34 permits a further movement of the carbons toward each other. Thus by this means the proper arc interval is restored through a step-bystep movement caused by alternately opening and closing the shunt-circuit and energizing and completely discharging the shunt-magnet 29.

In Fig. 9 I have diagrammatically represented a shunt-magnet or solenoid S0 which is differentially wound with two coils, designated as the outer coil Sl and the inner coil S2. The inner coil S2 is connected with the positive binding-post and also with the contact-spring 52, bearing on the wheel-section 5l of the driver-wheel 38, said inner coil and the leads thereto constituting a shunt-circuit 83, normally closed through the escapementlever 34. The outer coil of the shunt-magnet may be said to be included within abrauch or derived circuit 84. When the shunt-circuit 83 is broken or opened by the escapement-lever 34 disengaging from the teeth of the wheel-section 5l in the manner as described, the current normally circulating through the inner coil S2 is now caused to circulate through the outer coil 53, and thus the current in circula-ting through the diiferentially-wouud coils on the shunt-magnet 89 eifectually demagnetizes and completely discharges the same.

From the foregoing it is evident that the cscapement-lcvcr cooperates with the toothed IOO IIO

driver of the train of the wheelwork to completely sever the shunt-circuit, the point of contact between the lever and wheel being widely separated in the movement of the said driver. i

Having thus described my invention, what I claim as new therein, and desire to secure by Letters Patent, is-

l. In an arc-lamp, a main magnet or solenoid :for establishing the are, a shunt-magnety the escapement-wheel in its rotation severs the shunt-circuit, thereby permitting a feed of the carbons.

2. In an arc-lamp, the combination of a couple of vertically-disposed sliding .racks whereof one has its upper end provided with a laterally-extending arm which provides a holder for the upper carbon, and the other one has its lower end similarly provided with an arm which provides a holder for thelower carbon; a rotary shaft provided with two differently-sized pinions, whereof the relatively large one meshes with the rack supporting the carbon, and the relatively small one meshes with the rack supporting the lower carbon; a dri ver-wheel which comprises a couple of separated andinsulated toothed wheels, and which is carried by a shaft-gear connected with the aforesaid shaft carrying `the two differentlysized pinions; an escapement-lever which can vibrate between the two toothed wheels of the d river-wheels, and can alternately en gage the same; a shunt-circuit includingashunt-mag net which is energized upon the weakening of the arc; and means 'for operating the escapement-lever upon the energization of the shuntmagnet.

3. In an arc-lamp, the combination with the shunt and shunt-magnet or solenoid included therein, and with mechanism for permitting or causing a 'feed of the carbon or carbons, of a vibratory lever for operating or causing the operation of the feed mechanism; and means for actuating the vibratory lever upon the energization of the shunt-magnet or solenoid comprising aswinging frame pivotally supported near the upper end of such magnet or solenoid and having its lower end provided with a transversely-extending armature which can be attracted by the same and so vibrate the swinging frame, a spring having its upper end attached to an arm extending laterally from the swinging frame, and its lower end connected to the lamp-frame, so as to keep the armature of the swinging frame normally away 'from the end of the magnet or solenoid, and a pin secured to the vibratory lever and arranged to work in a slot formed in the swinging armature-frame, substantially as described.

4L. In an arclamp, a shunt-circuit, an cscapement-lever and train of wheelwork, a driver, a shunt-magnet which together with the escapement-lever and driver is included within the shunt-circuit, said driver consisting of two toothed gear-wheels insulated from each other and between which the escapement-lever oscillates to alternately engage the said gear-wheels.

In testimony whereof I alix my signature in presence ot' two Witnesses.

THEODORE M. FOOTE.

Witnesses:

(3i-nis, C. BULKLEY, L. M. BULKLEY. 

